FAA AMT (Aviation Maintenance Technician) Airframe Practice Exam

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To what depth is the mica insulation between the commutator bars of a dc generator undercut?

  1. Half the width of the mica

  2. Twice the width of the mica

  3. Equal to the width of the mica

  4. No undercut is necessary

The correct answer is: Equal to the width of the mica

The mica insulation between the commutator bars of a dc generator is typically undercut to a depth equal to the width of the mica. This is done to prevent sparking and wear on the commutator bars by providing a smooth surface for the brushes to glide over. Options A and B are incorrect because undercutting to only half or twice the width of the mica would not provide sufficient protection. Option D is also incorrect because undercutting is necessary for proper functioning of the generator.

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